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Skeletal myotubes grown for three weeks on gelatin hydrogel. Credit: Archana Bettadapur, Gio Suh, Evelyn Wang, Holly Huber, Alyssa Viscio and Megan McCain

Muscles-on-a-chip could be used to study muscle development and disease, as well as provide a relevant testing ground for new potential drugs. During normal embryonic development, skeletal muscles form when myoblasts fuse to form muscle fibers, myotubes. In past experiments, mouse myotubes have detached or delaminated from protein-coated plastic scaffolds after approximately one week and failed to thrive.

In this experiment, the researchers fabricated a gel scaffold from gelatin, a derivative of the naturally occurring muscle protein collagen, and achieved much better results...